Accumulated Other Comprehensive Income Details 1 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 344	$ 264
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	0	(1,433)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	344	(1,169)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	133	(192)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	211	(977)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	5,039	3,960
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	1,327	1,023
Income Tax Expense (Benefit)	21,382	20,739
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,923	1,960
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 3,712	$ 2,937